I had an ancestor named
Berenice (well, it was her middle name) and she was called
Bunny! I actually think
Bunny would be a cute nickname for
Frances, since that
Bunny was a
Frances Berenice.
I've heard of Cricket for
Christopher, which I like, along with
Chase for
Charles. I have characters Jehoshephat,
Hephzibah,
Kerenhappuch, and
Theophilus who get called
Jay, Zibby,
Keri, and Tep...
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